Converged Dirac R-matrix calculation of electron impact excitation of Fe XVII

Journal Article · Sat Dec 15 04:00:00 EST 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.062708· OSTI ID:21140659

Guoxin, Chen ^[1]

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1. ITAMP, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)

Large discrepancies exist between measurements [Brown et al., Phys. Rev. Lett. 96, 253201 (2006)] and previous calculations [Chen and Pradhan, Phys. Rev. Lett. 89, 013202 (2002)] for electron impact excitation (EIE) cross sections in 3C ({lambda} 15.015 A) and 3D ({lambda} 15.262 A) of Fe XVII. A converged Dirac R-matrix calculation of EIE in Fe XVII with an accuracy of {approx_equal}5% (from theory estimate) in 3C and 3D cross sections is reported. We carry out five sets of Dirac R-matrix calculations to establish the convergence in our calculations. Full relativistic effects are included and the convergence of both the correlation and channel coupling effects and the combined effects of interacting Rydberg resonance series in EIE of Fe XVII is achieved. The intrinsic oscillatory features of 3C and 3D effective cross sections convolved with electron distributions are further demonstrated. Compared with recent electron beam ion trap (EBIT) measurements, there is still an {approx_equal}20% difference. I give one possible reason for this puzzling difference.

• OSTI ID: 21140659
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ACCURACY
CATIONS
CONVERGENCE
CORRECTIONS
COUPLING
CROSS SECTIONS
DIRAC APPROXIMATION
DISTRIBUTION
ELECTRON BEAMS
ELECTRON CORRELATION
EXCITATION
IRON
R MATRIX
RELATIVISTIC RANGE
RESONANCE
RYDBERG STATES
TRAPS